What to overclock for gaming

What should I overclock in gaming: the CPU, GPU, RAM, or the monitor? I'm really confused at the moment and I don't know what will increase my frames per second for gaming. I don't have my hardware yet. I just want to know which would component will help improve gaming performance when overclocked. Thanks.

You must overclock both your CPU and your GPU because some games are CPU-limited and some games are GPU-limited. Overclocking RAM won't help much. As for the monitor I've overclocked mine to 67Htz from 60Htz. Every bit helps.

I'd say overclock both CPU and GPU, but before doing that, read out carefully about safe overclocking and all related stuff.
About the monitor thing, that Hz thing is your monitor's refresh rate, it's more of a visual thing than a performance thing.